Ventilating system

ABSTRACT

Ventilating system including a main flow passage in communication with an outside of a room, for supplying outdoor air to the room, or discharging room air to an outside of the room, at least one case having an inlet and an outlet in communication with the room, and connected to the main flow passage, an air supply flow passage connected to the main flow passage for supplying outdoor air to the room through the outlet, an air circulating flow passage connecting the room to the air supply flow passage in the case, for drawing room air through the inlet and supplying the room air to the room again, and a fan unit in the case for supplying the outdoor air introduced into the case through the air supply flow passage to the room, or supplying the room air introduced into the case through the air circulating flow passage to the room, again.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Application No.P2005-0012321 filed on Feb. 15, 2005, which is hereby incorporated byreference as if fully set forth herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to ventilating systems, and moreparticularly, to a compact ventilating system with an air purifyingfunction.

2. Discussion of the Related Art

Air in a closed room is gradually polluted as time passes-by due torespiration of people in the room. Therefore, it is required to replacethe polluted room air with fresh outdoor air, for which the ventilatingsystem is provided.

In general, the ventilating system is installed in a ceiling in theroom. Accordingly, an adequate space is required for installation of theventilating system, to require a great height between floors of adjacentflats, i.e., a flat height, which impairs spatial efficiency and economyof a building.

In the meantime, recently, for improving a living condition of the room,not only the ventilating system, but also an air cleaner, are started tobe used, for cleaning room air. In this case, an expense for buying theair cleaner is required, additionally. Moreover, the air cleaner, placedon a floor of the room in use, is difficult to remove dust suspended inthe air effectively, and liable to cause accidents caused by negligenceof safety, and fault because a baby or a child can make an easy accessthereto. Furthermore, if the ventilating system and the air cleaner areprovided separately, it is difficult to provide a comfortable roomenvironment in a case outdoor air introduced into the room by theventilating system is polluted because polluted outdoor air can besupplied to the room directly when the room is ventilated.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a ventilating systemthat substantially obviates one or more problems due to limitations anddisadvantages of the related art.

An object of the present invention is to provide a ventilating systemwhich requires no increase of a flat height of a building forinstallation of the ventilating system.

Another object of the present invention is to provide a ventilatingsystem which enables, not only cleaning of room air, but also cleaningof outdoor air supplied to the room during ventilation.

Additional advantages, objects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objectives and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein, aventilating system includes a main flow passage in communication with anoutside of a room, for supplying outdoor air to the room, or dischargingroom air to an outside of the room, at least one case having an inletand an outlet in communication with the room, and connected to the mainflow passage, an air supply flow passage connected to the main flowpassage for supplying outdoor air to the room through the outlet, an aircirculating flow passage connecting the room to the air supply flowpassage in the case, for drawing room air through the inlet andsupplying the room air to the room again, and a fan unit in the case forsupplying the outdoor air introduced into the case through the airsupply flow passage to the room, or supplying the room air introducedinto the case through the air circulating flow passage to the room,again.

The case has a shape of a thin hexahedron, and is installed at a cornerof a ceiling. The case has one side and a rear in close contact withroom walls at a corner of the room, and the other side and a frontexposed to the room provided with the outlet.

The case is in the room, and the main flow passage is in the ceiling ina state the main flow passage is connected to an upper surface of thecase. The main flow passage is provided to a corner of the ceiling in astate the main flow passage passes through the wall, and the case is inthe room in a state the case is connected to an underside of the mainflow passage.

Two or more than two cases are provided, and each of the cases isprovided in rooms different from each other.

The main flow passage includes a first port at a portion the air supplyflow passage starts in the case, and a main duct connected to the firstport for guiding outdoor air to the air supply flow passage. The mainduct includes an elbow passed through the corner of the room or aninside of the ceiling opposite to the corner.

In the meantime, the case includes a first inlet in an underside surfaceof the case for drawing room air for re-supplying to the room, a secondinlet in an underside surface of the case for drawing room air todischarge to an outside of the room, outlets in the front and the otherside of the case for discharging air introduced into the case to theroom, and an air guide for separating the outdoor air being introducedinto the room from room air being discharged to an outside of the room.

The main flow passage includes a first port in an upper surface of thecase, an air supply duct connected to the first port for guiding outdoorair to the case, a second port in the upper surface of the case, and anair discharge duct connected to the second port for guiding room airintroduced into the case to an outside of the room.

The ventilating system further includes an air discharge flow passage inthe case having one end connected to the air discharge duct for guidingthe room air introduced into the second inlet to the air discharge duct.

The ventilating system further includes an air supply damper provided tothe air supply duct for selective cut off of an air flow through the airsupply duct, and an air discharge damper provided to the air dischargeduct for selective cut off of an air flow through the air dischargeduct.

Preferably, the fan unit includes a turbofan for drawing outdoor air andpolluted room air in an axial direction and discharging in a radialdirection.

The ventilating system further includes a louver in the air circulatingflow passage for opening/closing the inlet.

In the meantime, the ventilating system may further include a 3-waydischarge ventilating device connected to the main flow passage formaking air supply and aid discharge at the same time.

The 3-way discharge ventilating device includes a case connected to theother end of the main flow passage, and provided in other room, havingoutlets in a front and opposite sides, and a first inlet and a secondinlet in an underside for drawing the room air, an air supply flowpassage in the case connected to the main flow passage for supplyingoutdoor air to the room through the outlet, an air discharge flowpassage in the case, and connected to the main flow passage, fordischarging room air to an outside of room through an inlet, an aircirculating flow passage in the case for re-supplying room air to theroom, and a fan unit in the case for forced suction of the outdoor airand the room air. The main flow passage includes an air supply ductconnected to the air supply flow passage, and an air discharge ductconnected to the air discharge flow passage.

The ventilating system may further include an air cleaning member in thecase for cleaning room air or outdoor air introduced into the case. Theair cleaning member includes a high efficiency dust filter,photo-catalyst, and active carbon in the case. The high efficiency dustfilter includes an HEPA (High Efficiency Particulate Arrestor) which canfilter microbes and particles of a size equal to or greater than 0.3 μm.The high efficiency dust filter includes an ULPA (Ultra Low PenetrationAbsolute) which can filter microbes and particles of a 0.01˜0.1 μm size.

In another aspect of the present invention, a ventilating systemincludes a main duct having an air supply duct for supplying outdoor airto a room, and an air discharging duct for discharging room air to anoutside of the room, at least one case in the room connected to the mainduct, the case having a first inlet for drawing the room air forre-supplying the room air to the room, a second inlet for drawing theroom air for discharging the room air to an outside of the room, and anoutlet for discharging the outdoor air to the room, an air guide in thecase for separating the outdoor air supplied to the case, and the roomair drawn into the case, and a fan unit in the case for supplying theoutdoor air to the room, or introducing room air into the case, andtherefrom, to the room.

The ventilating system may further include a heat exchanger provided toan outdoor portion where the air supply duct and the air discharge ductcross for making the outdoor air being supplied to the room and the roomair being discharged to an outside of the room to heat exchange,indirectly.

The ventilating system may further include an air supply fan in the airsupply duct for drawing the outdoor air. The ventilating system mayfurther include an air discharge fan in the air discharge duct fordischarging the room air.

The case includes an air supply flow passage in the case connected tothe air supply duct for guiding the outdoor air to the outlet through anunderside of the fan unit, an air circulating flow passage in the caseconnected to the air supply flow passage for drawing the room air intothe case through the first inlet and supplying to the room again, and anair discharge flow passage in the case connected to the air dischargeduct for drawing the room air through the second inlet and guiding theroom air to the air discharge duct. The ventilating system may furtherinclude an air cleaning member in the case for cleaning the room air, orthe outdoor air introduced into the case.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings;

FIG. 1 illustrates a perspective view of a ventilating system inaccordance with a first preferred embodiment of the present invention ina state installed in a room;

FIG. 2 illustrates a perspective view of an exterior of the ventilatingsystem in FIG. 1;

FIG. 3 illustrates a section of a variation of an inside structure ofthe ventilating system in FIG. 1;

FIGS. 4 to 6 illustrate perspective views of examples of installation ofthe ventilating system in accordance with a first preferred embodimentof the present invention;

FIG. 7 illustrates a section of another variation of an inside structureof the ventilating system in FIG. 1, showing an air flow when theventilating system is operating in a first operation mode;

FIG. 8 illustrates a section of the ventilating system in FIG. 7,showing an air flow when the ventilating system is operating in a secondoperation mode;

FIG. 9 illustrates a perspective view of another variation theventilating system in FIG. 1;

FIG. 10 illustrates a section of the 3-way discharge ventilating devicein FIG. 9; and

FIG. 11 illustrates a section of the ventilating system in accordancewith a second preferred embodiment of the present invention, showing anair flow when the ventilating system is operating in a second operationmode.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts.

FIGS. 1 to 11 illustrate ventilating systems in accordance with a firstpreferred embodiment of the present invention.

Referring to FIGS. 1 to 11, the ventilating system has a case 100installed, for an example, at a corner of a ceiling 10 of a room asshown in FIG. 1. The case 100 has a rear 101 and a first side 103connected to each other and in close contact with a corner of a roomwall 20, and a front 105 and a second side 107 facing the room.

The case 100 has at least one first inlet 110, second inlet 150, andoutlet 120 in communication with the room. As shown in FIG. 1, the firstinlet 110 is provided to a front side of an underside of the case 100,and the second inlet 150 is provided to a rear of the underside of thecase 100, and, as shown in FIG. 2, the outlet 120 is provided in a stateportions of the outlet 120 on a front 105 side and a second side 107,both of which face the room, are connected.

At least one case 100 may be installed in each room for introduction ofoutdoor air or discharge of room air through a main flow passage.

It is preferable that the second inlet 150 is provided, selectively. Foran example, as shown in FIG. 3, if air is only supplied withoutdischarging room air to an outside of the room, no second inlet 150 isrequired.

The ventilating system includes a main flow passage 1 in communicationwith an outside of the room, for supplying outdoor air to the room, ordischarging room air to an outside of the room, and an air supply flowpassage 3 connected to the main flow passage 1 for supplying outdoor airto the room through the outlet 120, wherein the main flow passage 1passes through an upper portion of the case 100, and the air supply flowpassage 3 passes through an inside of the case 100. The passages will bedescribed in detail with reference to above drawings.

The main flow passage 1 makes an outside of the room and the cases 100in communication. The main flow passage 1 is connected to a top of thecase 100. For an example, as shown in FIGS. 1 and 4, the case 100 isprovided to the room, and the main flow passage 1 may be provided to theroom together with the case 100. Or, alternatively, as shown in FIGS. 5and 6, if there is a surplus space in the ceiling 10, the case 100 maybe provided to the room, and the main flow passage 1 may be provided toan inside of the ceiling 10. This is for providing the ventilatingsystem suitable to a structure of the building taking the structure ofthe building into account at the time of installation of the ventilatingsystem. For an example, if there is a surplus space in the ceilingwithout increasing the height of the flat of the building, the main flowpassage 1 is installed inside of the ceiling 10, while the case 100 isinstalled in the room, and opposite to this, if there is no surplusspace inside of the ceiling 10, the main flow passage 1 and the case 100are installed in the room, for reducing the height of the flat.

Taking operation conditions of the ventilating system into account, themain flow passage 1 may have a structure in which only the air supply ismade or a structure in which both the air supply and air discharge aremade at the same time.

Referring to FIG. 3, in a case of the structure in which only the airsupply is made, the main flow passage 1 includes a first port 130provided to the case 100, and a main duct 200 connected to the firstport 130 for guiding outdoor air to the air supply flow passage 3. Thefirst port 130 is provided to one side of an upper surface of the case100. This is because the first port 130 may be provided to a left sideor a right side of the upper surface of the case 100, taking a wallstructure 20 of the room where the ventilating system is installed.

Referring to FIG. 2, the main duct 200 passes through a corner of theroom or the inside of the ceiling 10 in the vicinity of the corner, andincludes an elbow 201 having at least one of the cases 100 connectedthereto. The elbow 201 connects respective main ducts 200, for anexample, if a case (not shown) provided to other room is arrangedperpendicular to the case 100 of the room.

In the meantime, referring to FIGS. 7 and 8, the main flow passage 1,provided to make air supply and air discharge at the same time, includesa first port 130 provided to the upper surface of the case 100, an airsupply duct 210 connected to the first port 130 for guiding outdoor airto the case 100, a second port 170 provided to an upper surface of thecase 100, and a discharge duct 220 connected to the second port 170 forguiding room air introduced into the case 100 to an outside of the room.It is preferable that a discharge flow passage 3 connected to the secondport 170 is provided to inside of the case 100, and there is a secondinlet 150 in an underside surface of the case 100, for introducing roomair thereto and discharging to an outside of the room. It is preferablethat an air discharge fan 740 is provided in the discharge duct 220 fordrawing room air and discharging to an outside of the room. It is morepreferable that the second port 170 is provided with an air dischargedamper 530 for selective cut off of the air flowing into the case 100.

The air supply flow passage 3 is connected to the main flow passage 1for supplying outdoor air to the room through the outlet 120, and, foran example, starts from a connection portion of the main flow passage 1and the case 100 and connected to the outlet 120 via the inside of thecase 100. That is, in the course of introduction of outdoor air into theroom, the outdoor air, introduced into, and is flowing through the mainflow passage 1, passes through the air supply flow passage 3 in the case100 and supplied to the room through the outlet 120.

There is an air circulation flow passage 5 in the case 100 for makingthe room and the air supply flow passage 3 in the case 100 incommunication. The air circulation flow passage introduces the room airinto the case 100, and returns to the room again. For an example, suchan air circulation flow passage includes the first inlet 110 in theunderside surface of the case 100, and the outlet 120 in the front 105and the second side 107 of the case 100. The air circulating flowpassage 5 meets with the air supply flow passage 3 at an inside of thecase 100. Accordingly, both the room air introduced into the case 100through the air circulation flow passage 5 and the outdoor airintroduced into the case 100 through the air supply flow passage 3 issupplied to the room through the outlet 120.

Inside of the case 100, there is a fan unit 300 for supplying the airintroduced into the case 100 through the main flow passage 1 or the aircirculation flow passage 5 to the room. The fan unit 300 supplies theoutdoor air introduced into the air supply flow passage 3 in the case100 through the main flow passage 1 connected to the case 100 to theroom, or returns the room air introduced into the case 100 through thefirst inlet 110 in the underside surface of the case 100 to the room,again. The fan unit 300 includes, for an example, a turbofan 310 fordrawing air in an axial direction and discharging the air in a radialdirection, and a fan motor 320 for driving the turbofan 310. Theapplication of the turbofan 310 enables, not only to make the casecompact, but also to enhance a fan efficiency.

The case 100 may further be provided with an air guide 400 forseparating the air supply flow passage 3 from the air discharge flowpassage 5. The air guide 400 in the case 100 on one side thereofseparates the first inlet 110 from the second inlet 150. According tothis, the air guide 400 guides outdoor air introduced into the case 100through the air supply duct 210 to the outlet 120, and the room airintroduced into the case 100 through the second inlet 150 to thedischarge duct 220.

In the meantime, as described before, in a case the ventilating systemis operated in an air cleaning mode by using outdoor air only in a statethe main flow passage 1, of which structure enables only air supply, butnot air discharge, is connected to the case 100, the air guide 400 maynot be provided.

The air circulating flow passage 5 has at least one louver 111 mountedtherein for opening/closing the air circulating flow passage 5. Thelouver 111 opens the first inlet 110, selectively. For an example, in acase of the air cleaning mode by using outdoor air only, the louver 111is operated to close the first inlet 110, to prevent room air from beingintroduced into the case 110 through the first inlet 110, and in a caseof the air cleaning mode by using indoor air only, the louver isoperated, to open the first inlet 110, for introducing room air into thecase 100 through the first inlet 110.

The air supply flow passage 3 may have an air supply damper 510 mountedtherein for opening/closing the air supply flow passage 3. The airsupply damper 510 is provided to open/close, for an example, the firstport 130, so that the first port 130 is opened when the ventilatingsystem introduces outdoor air into the room through the air supply flowpassage 3, and the first port 130 is closed when the ventilating systemcirculates room air by using the air circulating flow passage 5.

The ventilating system may have a guide vane 121 provided to the outlet120 for controlling a direction of air discharged to the room throughthe outlet 120.

There may be an air cleaning member 600 provided in the case 100. Theair cleaning member 600 is mounted, for an example, under the turbofan310, for cleaning outdoor air introduced into the case 100 through theair supply duct 210, and room air introduced into the case 100 throughthe first inlet 110. The air cleaned in the case 100 is supplied to theroom through the outlet 120. Therefore, once the air cleaning member 600is provided, the ventilating system of the present invention can supplyclean air to the room in both cases when the ventilating systemventilates the room, or circulates the room air.

The air cleaning member 600 includes a high efficiency dust filter 610,optical catalyst 620, and active carbon 630. The high efficiency dustfilter 610 is provided for filtering dust from polluted room air, andoptical catalyst 620 and the active carbon 630, materials both havingpowerful adsorptivity, are provided for removing fine odor particles andthe like from air. As the high efficiency dust filter 610, an HEPA (HighEfficiency Particulate Arrestor) or an ULPA (Ultra Low PenetrationAbsolute) may be used. The HEPA has a cleaning capability of removing99.97% of particles, such as dust, bacteria, virus of a size equal to orgreater than 0.3 μm, and the ULPA has a capability of removing 99.999%of particles, such as fine particle, virus, bacteria, dandruff, fungus,pollen, radon decay products, various smokes, and so on of a 0.01˜0.1 μmsize.

In the meantime, referring to FIG. 9, in the ventilating system inaccordance with the first preferred embodiment of the present invention,a 3-way discharge ventilating device may be connected to the main flowpassage 1. The 3-way discharge ventilating device, having three outlets920, is connected to the main flow passage 1 of the ventilating systemof the present invention and installed in other room.

In more detail, referring to FIGS. 9 and 10, the 3-way dischargeventilating device includes a case 900 having outlets 920, for anexample, in a front and side surfaces, a first inlet 910 for drawingroom air and discharging to the room again, and a second inlet 950 fordrawing room air and discharging to an outside of the room, an airsupply flow passage 3 in the case 900 connected to the main flow passage1 for supplying outdoor air through the outlets 920, an air dischargeflow passage 7 in the case 900 connected to the main flow passage 1 fordischarging room air to an outside of the room through the second inlet950, an air circulating flow passage 5 in the case 900 for re-supplyingroom air drawn through the first inlet 910 to the room, and a fan unit300 in the case 100 for forced suction of outdoor air and room air. Themain flow passage 1 has an air supply duct 210 connected to the airsupply flow passage 3 and an air discharge duct 220 connected to the airdischarge flow passage 7.

Therefore, one portion of outdoor air supplied through the main flowpassage 1 may be supplied to the case 100 of the ventilating system, andthe other portion may be supplied to the case 900 of the 3-way dischargeventilating device through the main flow passage 1.

The foregoing ventilating system in accordance with a first preferredembodiment of the present invention is operative in a first operationmode for cleaning room air while circulating the room air, and a secondoperation mode for ventilating the room by introducing outdoor air intothe room and discharging room air to an outside of the room. Theoperation of the ventilating for each of the operation modes will bedescribed, with reference to FIGS. 7 and 8.

Referring to FIG. 7, in the first operation mode, the air supply damper510 closes the first port 130, and the louver 111 opens the first inlet110.

Then, the turbofan 310 in the case 100 is put into operation, for makingpolluted room air to flow to the air circulating flow passage in thecase 100 through the first inlet 110 in an underside surface of the case100. The polluted room air flowed to the air circulating flow passage inthe case 100 passes through the air cleaning member 600 and the turbofan310, flows to an upper space of the case 100, and supplied to the roomthrough the outlet 120. In this instance, since the dust collectingfilter 610, the photo catalyst 620, and the active carbon 630 of the aircleaning member 600 remove foreign matters from the polluted room air,the cleaned air can be supplied to the room. Since the air supply damper510 closes the first port 130 during above steps, the outdoor air cannot be introduced into the case 100, and only the room air is introducedinto, and cleaned at the case 100, and discharged to the room. Theventilating system cleans room air while circulating the room aircontinuously.

Next, referring to FIG. 8, in the second operation mode of theventilating system having the main flow passage 1 enabling air supplyand discharge provided thereto, the air supply damper 510 opens thefirst port 130, and the louver 111 closes the first inlet 110. The airdischarge damper 520 opens the first inlet 170.

Upon putting the turbofan 310 in the case 100 into operation, outdoorair flows through the air supply duct 210 of the main flow passage 1,and introduced into the case 100. The outdoor air introduced into thecase 100 flows along the air supply flow passage 3. The outdoor airflowing through the air supply flow passage 3 passes through, andcleaned at the air cleaning member 600, and supplied to the room throughthe outlet 120. As described before, since the louver 111 closes thefirst inlet 110 during above steps, the room air is not introduced intothe case 100 through the first inlet 110.

In the meantime, since the air discharge fan 740 is in operation, roomair is introduced into the case 100 through the second inlet 150, andflows along the air discharge flow passage 7. Since the first inlet 110and the second inlet 150 are separated by the air guide 400, the roomair introduced into the case 100 through the second inlet 150 is notmixed with the outdoor air introduced into the case 100 through the airsupply duct 210. The room air introduced into the case 100 through thesecond inlet 150, and flows along the air discharge flow passage 5 isdischarged through the second port 170 and the air discharge duct 220.Therefore, the ventilating system supplies outdoor air and polluted roomair in cleaned states, and discharges polluted room air to an outside ofthe room, to make the room more comfortable.

In the meantime, in the second operation mode, only air supply can bemade depending on an air state of the room by stopping the air dischargefan 740, to stop air discharge from the room to an outside of the room.

In the meantime, though a case when the outdoor air supplied to the mainflow passage 1 is supplied to the ventilating system in the first, andsecond operation modes, if a portion of the outdoor air is introducedinto the case 900 of the 3-way discharge ventilating device describedbefore through the main flow passage 1, the 3-way discharge ventilatingdevice can be operated in the first, or second operation mode togetherwith the ventilating system.

FIG. 11 illustrates a section of the ventilating system in accordancewith a second preferred embodiment of the present invention, showing anair flow when the ventilating system is operating in a second operationmode.

Because the ventilating system in accordance with a second preferredembodiment of the present invention has a system similar to theventilating system in accordance with a first preferred embodiment ofthe present invention, detailed description will be omitted. However,the ventilating system in accordance with a second preferred embodimentof the present invention includes a main flow passage 1 having an airsupply duct 210 and an air discharge duct 220, and a heat exchanger 700provided at an outdoor portion where the air supply duct 210 and the airdischarge duct 220 cross, for making outdoor air supplied to the room,and the room air discharged to an outside of the room to heat exchangeindirectly.

The ventilating system further includes an air supply fan 730 providedin the air supply duct 210 to assist operation of the turbofan 310, forenhancing air supply efficiency.

The ventilating system further includes an air discharge fan 740provided in the air discharge duct 220 for discharging room air to anoutside of the room.

In the meantime, the case is provided with an air cleaning member 600having a high efficiency dust filter 610, photo catalyst 620, and activecarbon in the case 100. Because the operation of the foregoingventilating system in accordance with a preferred embodiment of thepresent invention is similar to the first embodiment, description of theoperation will be omitted, except the heat exchanger 700 is operatedselectively, to make the room air flowing through the air supply duct210 and the air discharge duct 220 heat exchange indirectly. Therefore,the outdoor air introduced into the room in the second operation mode issupplied to the room after heated or cooled by the room air dischargedto an outside of the room, sharp change of the room air can beprevented.

As has been described, the ventilating system of the present inventioncan carry out both ventilation and cleaning of room air by using oneunit, permitting to reduce an expense for purchasing ventilating and aircleaning equipment, and to vary an installation configuration accordingto a wall structure of the room and a height of flat and ceiling.Accordingly, the ventilating system of the present invention permits toreduce a flat height, to reduce an initial construction cost, and toincrease an number of stories for the same height of building, tomaximize a spatial efficiency. In addition to this, the air cleaningmember and the heat exchanger in the ventilating system permits toprovide air of an appropriate temperature to the room in winter orsummer, and a comfortable room environment by providing cleaned air,always.

The turbofan permits to prevent reduction of air supply rate caused by apressure loss even if the high efficiency dust filter is used. The useof main flow passage for introduction of outdoor air or discharge ofroom air permits to install different units in each of the rooms.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the inventions. Thus, itis intended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A ventilating system comprising: a main flow passage in communicationwith an outside of a room, for supplying outdoor air to the room, ordischarging room air to an outside of the room; at least one case havingan inlet and an outlet in communication with the room, and connected tothe main flow passage; an air supply flow passage connected to the mainflow passage for supplying outdoor air to the room through the outlet;an air circulating flow passage connecting the room to the air supplyflow passage in the case, for drawing room air through the inlet andsupplying the room air to the room again; and a fan unit in the case forsupplying the outdoor air introduced into the case through the airsupply flow passage to the room, or supplying the room air introducedinto the case through the air circulating flow passage to the room,again.
 2. The ventilating system as claimed in claim 1, wherein the casehas a shape of a thin hexahedron, and is installed at a corner of aceiling.
 3. The ventilating system as claimed in claim 1, wherein thecase has one side and a rear in close contact with room walls at acorner of the room, and the other side and a front exposed to the roomprovided with the outlet.
 4. The ventilating system as claimed in claim1, wherein the case is in the room, and the main flow passage is in theceiling in a state the main flow passage is connected to an uppersurface of the case.
 5. The ventilating system as claimed in claim 1,wherein the main flow passage is provided to a corner of the ceiling ina state the main flow passage passes through the wall, and the case isin the room in a state the case is connected to an underside of the mainflow passage.
 6. The ventilating system as claimed in claim 1, whereintwo or more than two cases are provided, and each of the cases isprovided in rooms different from each other.
 7. The ventilating systemas claimed in claim 1, wherein the main flow passage includes; a firstport at a portion the air supply flow passage starts in the case, and amain duct connected to the first port for guiding outdoor air to the airsupply flow passage.
 8. The ventilating system as claimed in claim 1,wherein the main duct includes an elbow passed through the corner of theroom or an inside of the ceiling opposite to the corner.
 9. Theventilating system as claimed in claim 1, wherein the case includes; afirst inlet in an underside surface of the case for drawing room air forre-supplying to the room, a second inlet in an underside surface of thecase for drawing room air to discharge to an outside of the room,outlets in the front and the other side of the case for discharging airintroduced into the case to the room, and an air guide for separatingthe outdoor air being introduced into the room from room air beingdischarged to an outside of the room.
 10. The ventilating system asclaimed in claim 9, wherein the main flow passage includes; a first portin an upper surface of the case, an air supply duct connected to thefirst port for guiding outdoor air to the case, a second port in theupper surface of the case, and an air discharge duct connected to thesecond port for guiding room air introduced into the case to an outsideof the room.
 11. The ventilating system as claimed in claim 9, furthercomprising an air discharge flow passage in the case having one endconnected to the air discharge duct for guiding the room air introducedinto the second inlet to the air discharge duct.
 12. The ventilatingsystem as claimed in claim 9, further comprising an air supply damperprovided to the air supply duct for selective cut off of an air flowthrough the air supply duct.
 13. The ventilating system as claimed inclaim 9, further comprising an air discharge damper provided to the airdischarge duct for selective cut off of an air flow through the airdischarge duct.
 14. The ventilating system as claimed in claim 1,wherein the fan unit includes a turbofan for drawing outdoor air andpolluted room air in an axial direction and discharging in a radialdirection.
 15. The ventilating system as claimed in claim 1, furthercomprising a louver in the air circulating flow passage foropening/closing the inlet.
 16. The ventilating system as claimed inclaim 1, further comprising a 3-way discharge ventilating deviceconnected to the main flow passage for making air supply and aiddischarge at the same time.
 17. The ventilating system as claimed inclaim 16, wherein the 3-way discharge ventilating device includes; acase connected to the other end of the main flow passage, and providedin other room, having outlets in a front and opposite sides, and a firstinlet and a second inlet in an underside for drawing the room air, anair supply flow passage in the case connected to the main flow passagefor supplying outdoor air to the room through the outlet, an airdischarge flow passage in the case, and connected to the main flowpassage, for discharging room air to an outside of room through aninlet, an air circulating flow passage in the case for re-supplying roomair to the room, and a fan unit in the case for forced suction of theoutdoor air and the room air.
 18. The ventilating system as claimed inclaim 17, wherein the main flow passage includes; an air supply ductconnected to the air supply flow passage, and an air discharge ductconnected to the air discharge flow passage.
 19. The ventilating systemas claimed in claim 1, further comprising an air cleaning member in thecase for cleaning room air or outdoor air introduced into the case. 20.The ventilating system as claimed in claim 19, wherein the air cleaningmember includes a high efficiency dust filter, photo-catalyst, andactive carbon in the case.
 21. The ventilating system as claimed inclaim 20, wherein the high efficiency dust filter includes an HEPA (HighEfficiency Particulate Arrestor) which can filter microbes and particlesof a size equal to or greater than 0.3 μm.
 22. The ventilating system asclaimed in claim 20, wherein the high efficiency dust filter includes anULPA (Ultra Low Penetration Absolute) which can filter microbes andparticles of a 0.01˜0.1 μm size.
 23. A ventilating system comprising: amain duct having an air supply duct for supplying outdoor air to a room,and an air discharging duct for discharging room air to an outside ofthe room; at least one case in the room connected to the main duct, thecase having a first inlet for drawing the room air for re-supplying theroom air to the room, a second inlet for drawing the room air fordischarging the room air to an outside of the room, and an outlet fordischarging the outdoor air to the room; an air guide in the case forseparating the outdoor air supplied to the case, and the room air drawninto the case; and a fan unit in the case for supplying the outdoor airto the room, or introducing room air into the case, and therefrom, tothe room.
 24. The ventilating system as claimed in claim 23, furthercomprising a heat exchanger provided to an outdoor portion where the airsupply duct and the air discharge duct cross for making the outdoor airbeing supplied to the room and the room air being discharged to anoutside of the room to heat exchange, indirectly.
 25. The ventilatingsystem as claimed in claim 24, further comprising an air supply fan inthe air supply duct for drawing the outdoor air.
 26. The ventilatingsystem as claimed in claim 24, further comprising an air discharge fanin the air discharge duct for discharging the room air.
 27. Theventilating system as claimed in claim 23, wherein the case includes; anair supply flow passage in the case connected to the air supply duct forguiding the outdoor air to the outlet through an underside of the fanunit, an air circulating flow passage in the case connected to the airsupply flow passage for drawing the room air into the case through thefirst inlet and supplying to the room again, and an air discharge flowpassage in the case connected to the air discharge duct for drawing theroom air through the second inlet and guiding the room air to the airdischarge duct.
 28. The ventilating system as claimed in claim 23,further comprising an air cleaning member in the case for cleaning theroom air, or the outdoor air introduced into the case.